Perpetual measurement chamber



FIG. 1 is a bottom plan view thereof;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a perspective view thereof;

FIG. 6 is a bottom plan view of an alternative embodiment thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a back side elevational view thereof;

FIG. 9 is a front side elevational view thereof;

FIG. 10 is a right side elevational view thereof; and,

FIG. 11 is a left side elevational view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a perpetual measurement chamber, as shown and described. 